S&S Petroleum

S&S Petroleum, based in Mukilteo, Washington, started with one California gas station in 1998 and has expanded to 110 owned-and-operated convenience stores and fuel stations in Washington, Oregon, Idaho and California. The company executed a significant acquisition in 2023 of Leathers Enterprises, Fairview, Oregon, which included 24 convenience stores in Oregon. Nine were company-operated and 15 were managed through dealer consignment agreements.

It does business as an ampm franchisee and operates unbranded stores and a Royal Mart in partnership with branded fuel marketers Mobil, Arco and Shell. S&S locations support a variety of community-based organizations, such as high school sports teams, the Boys and Girls Club of America, Toys for Tots, slain officer memorials, police fundraisers, children's hospitals and local food banks.

For benchmarking purposes, store counts are as of Jan. 1, 2024.